I have had a discussion about this a few years ago, but am having a new problem.
I have a 1952 mercury and I am curious if when I’m going to stop or slow down if I need to take it out of overdrive before doing so. The overdrive relay does not work in this car so I rigged up a switch that I can use to turn the overdrive on after reaching about 30 mph. I do turn it off before stopping or slowing down.
Now when I get above 30 mph and turn on the switch to engage the overdrive, it rarely shifts into the overdrive gear.
The last time it worked I hit a hard bump on a gravel road which cause the car to die, but after that until I shut the car off, the overdrive seemed to engage.
Could it be a connection issue? When I have the car running and parked and turn the switch on for the overdrive I can hear it click.
Any thoughts would be appreciated!